SAE 50 oil flows at 3 m/s between 0.25 m-long parallel plates spaced 3 mm apart. If the plates are at 400 K and the average of the inlet and outlet bulk temperatures is 360K. Determine the average heat transfer coefficient.
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- 5.7 The average Reynolds number for air passing in turbulent flow over a 2-m-long, flat plate is . Under these conditions, the average Nusselt number was found to be equal to 4150. Determine the average heat transfer coefficient for an oil having thermal properties similar to those in Appendix 2, Table 18, at at the same Reynolds number and flowing over the same plate.Water flows at 1 kg/s in a 10 mm diameter tube and is to be heated from 25 to 75 ° C. The tube surface temperature is maintained at 100 °C. Using the following properties for the water: p= 998 kg/m?, Cp = 4171 J/kg K, k = 0.651 W/m K, µs = 4.71 x 104 kg/m s, Uw = 2.82 x 104 kg/m s and Pr= 3.02. a) What is the required tube length for these conditions? b) To design a water heating system, consider using tube diameters in the range from 10 to 30 mm. What are the required tube lengths for water flow rate of 1 kg/s? Plot the tube length as a function of tube diameter.Water flows at 1 kg/s in a 10 mm diameter tube and is to be heated from 25 to 75 ° C. The tube surface temperature is maintained at 100 °C. Using the following properties for the water: p= 998 kg/m?, Cp = 4171 J/kg K, k = 0.651 W/m K, µs = 4.71 x 104 kg/m s, Hw = 2.82 x 104 kg/m s and Pr = 3.02. a) What is the required tube length for these conditions? b) To design a water heating system, consider using tube diameters in the range from 10 to 30 mm. What are the required tube lengths for water flow rate of 1 kg/s? Plot the tube length as a function of tube diameter. c) Plot the pressure gradient as a function of the tube diameter for the given water flow rate of 1 kg/s. Assume tube wall is smooth.
- A steam reservoir is covered by a rectangular plate (its length is 1 m and width 2 m). The steam temperature is 95o C, and it is in contact with the plate. Over the outside surface of the plate, water is flowing at a speed of 3 m/sec at a temperature of 25o C. What is the mean Nusselt number over the plate? What is the mean heat transfer convective coefficient over the plate? What is the heat transfer rate to the water?Water flows at 1 kg/s in a 10 mm diameter tube and is to be heated from 25 to 75 ° C. The tube surface temperature is maintained at 100 °C. Using the following properties for the water: p= 998 kg/m?, Cp = 4171 J/kg K, k = 0.651 W/m K, po = 4.71 x 104 kg/m s, Pw = 2.82 x 104 kg/m s and Pr = 3.02. a) What is the required tube length for these conditions?Engine oil flows through a 50 mm diameter tube at an average temperature of147°C. The flow velocity is 80 cm/s. Calculate the average heat transfer coefficient if the tube wall is maintained at a temperature of 200°C and it is 2 m long. Hint: Area can be assumed to be equal to the vertical projectiion of the tube , i.e. LD. Ans.: h = 377.36 W/m2.K . Draw an illustration. Note: use the formula on the picture
- Water is flowing through a 25-mm diameter and 10-m long tube. The water enters the tube at 20\deg C with a mass flow rate of 0.2 kg/s. The outlet mean temperature is 60\deg C, and the tube surface temperature is maintained constant. Determine the hydrodynamic and thermal entry.lengths. Is the flow fully developed? What is the convective heat transfer coefficient inside the pipe?Engine oil enters the 5 mm diameter pipe at 120°C. The pipe surface temperature is kept at 40°C and the Re number is about 1000. Calculate the heat lost by the fluid for a 30 cm long pipe? Engine oilYou can get its specs at 390K.Water at 20°C flows through smooth tubes of 25 mm dia at a mean velocity of 2.2 m/s. The surface of the tube is at 5°C and the water is chilled in the process. The tube is 4 m long. Determine the outlet temperature of the water.
- For laminar flow over a flat plate, the local heat transfer coefficient hx = x-1/2 where x is the distance from the leading edge (x=0) of the plate. What is the average heat transfer coefficient hx from the leading edge to location x.Q8) A 0.4 W cylindrical electronic component with diameter 0.3 cm and length 1.8 cm and mounted on a circuit board is cooled by air flowing across it at a velocity of 150 of the m/min. If the air temperature is 40°C, determine the surface temperature component. omWater at 15ºC is to be heated to 65ºC by passing it over a bundle of 4-m-long 1-cm-diameter resistance heater rods maintained at 90ºC. Water approaches the heater rod bundle in normal direction at a mean velocity of 0.8 m/s. The rods arc arranged in-line with longitudinal and transverse pitches of SL 4 cm and ST 3 cm. Determine the number of tube rows NL in the flow direction needed to achieve the indicated temperature rise.